feat(dirvish): make dired d=diff and D=delete to match the convention

dired's d was dired-flag-file-deletion and D was dired-do-delete, while the ediff diff sat on e. Bind d to the ediff diff and keep D as delete, so the d=diff / D=delete pair is consistent with C-; b and ibuffer. d no longer flags for deletion -- mark with m for batch deletes, then D. Fix the stale commentary (it called d "delete" and D "duplicate") and add which-key labels for the pair.

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